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Method for recycling metal gallium from gallium nitride waste

A gallium nitride and metal gallium technology, applied in the field of gallium nitride waste recycling, can solve the problems of slow reaction speed and unsuitable for industrial production, and achieve fast reaction speed, easy industrial production, and thorough reaction

Active Publication Date: 2016-05-11
NANJING JINMEI GALLIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also reported that aqua regia and gallium nitride are used to react, the reaction speed is very slow, and harmful waste gas of nitrogen oxides is produced during the reaction process, which is not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: A method for recovering gallium metal from gallium nitride waste, 500g of gallium nitride is placed in a reaction vessel, then a mixed solution of sodium hydroxide and hydrogen peroxide is added dropwise to the reaction vessel, and the mixed solution is The mass ratio of sodium hydroxide to hydrogen peroxide is 1:1.5 until gallium nitride is completely dissolved; finally, the reaction solution is passed through electrowinning to recover 392g of metal gallium.

Embodiment 2

[0009] Example 2: Put 1000g of gallium nitride in the reaction vessel, then drop the mixed solution of sodium hydroxide and hydrogen peroxide into the reaction vessel, the mass ratio of sodium hydroxide and hydrogen peroxide in the mixed solution is 1:4.5, add When the proportion of hydrogen peroxide is increased, the reaction speed is accelerated until the gallium nitride is completely dissolved; finally, the reaction solution is passed through electrowinning, and 793g of metal gallium is recovered.

Embodiment 3

[0010] Example 3: 1000g of gallium nitride is placed in the reaction vessel, then the mixed solution of sodium hydroxide and sodium peroxide is added dropwise into the reaction vessel, the mass ratio of sodium hydroxide and sodium peroxide in the mixed solution is 1:0.5, until Gallium nitride is completely dissolved; finally, the reaction solution is passed through electrowinning, and 801g of metal gallium is recovered.

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PUM

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Abstract

The invention discloses a method for recycling metal gallium from gallium nitride waste. The method comprises the following steps: putting gallium nitride into a reaction container; dropwise adding sodium hydroxide and an oxidant, for example a mixed solution of hydrogen peroxide and sodium peroxide, into the reaction container until the gallium nitride is completely dissolved; and finally, recycling the metal gallium by carrying out electro-deposition on a reaction liquid. According to the method disclosed by the invention, mixed alkali liquor and a gallium nitride material react completely at a high speed, and the metal gallium is recycled from the reaction liquid through an electro-deposition method with a recovery rate being 95% or higher, so that the method is easily applied to industrial production.

Description

technical field [0001] The invention relates to a method for recycling gallium nitride waste, in particular to a method for recycling metal gallium from gallium nitride waste. Background technique [0002] The current process for producing gallium nitride substrates basically uses metal-organic source vapor deposition to grow gallium nitride on sapphire. In the gallium nitride waste produced during the production process, the gallium content is 70-80%, which is much higher than the gallium-containing waste produced in some III-V compound semiconductor processes such as gallium arsenide and gallium phosphide. [0003] The melting point of gallium nitride is about 1700°C, and the high melting point makes it difficult to recover metal gallium by decomposition. However, there are also related reports that gallium nitride is decomposed into metal gallium and ammonia gas under high temperature conditions by using hydrogen flow method, but the recovery rate of metal gallium is not...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B58/00C25C1/22
CPCC22B7/008C22B58/00C25C1/22Y02P10/20
Inventor 刘文兵杨桂芳
Owner NANJING JINMEI GALLIUM